of whiting



1,628 348 May 1927' H. v. ATWELL SEAL Filed Oct. 16, 1925 Patented May10, 1927.

HAROLD V. ATWELL, F WHITING, INDIANA, ASSIGNOR T0 STANDARD OIL COINL.

PANY, OF WHITING, INDIANA, A CORPORATION OF INDIANA.

SEAL.

Application filed October 16, 1925. Serial No. 62,788.

The present invention relates to improvements in liquid seals, moreparticularly of the type disclosed in my prior Patent No. 1,529,682,granted March 17, 1925. The

a present invention will be fully understood from the followingdescription, illustrated by the accompanying drawings, in which:

Figure l is aside elevation, partly in section, of a seal embodying thepresent invention; and

Fig. 2 is a transverse sectional View on the line 2-2 of Fig. 1.

Referring more particularly to the drawings, the numeral 5 indicates apan, from the bottom of which an open pipe section 7 extends upwardlyfor aportion of the height of the pan 5. To the bottom of the pan 5there is secured a downwardly projecting pipe section 8, by whichconnection so may be made to the open end of a pipe (not shown) leadingto the device, for example, a gasoline storage tank, containing a vaporspace in which the pressure is to be con-- trolled,

On the opposite sides of the upwardly projecting internal wall 7 thereare provided upstanding lugs 9, which support a transversely extendingpivot rod 10. An inverted cup 11 is supported on this pivot rod, forexample, by attaching inside of the cup,

on opposite walls, the bent notched plates 12, which rest on theprojecting ends of pivot rod'lO. These plates are so placed on theinside of the cup 11 that the point 33 of support of the cup is at oneside of its center of area, so that the cup will be tilted bydifferences of pressure in either direction between the externalatmosphere and the vapor space of the device to which the still isconnected. I

Near each end of the cup 11, on opposite sides thereof, there areprovided the vertical plates 13, the upper edges of which are notched asat 14- In alignment with each pair of these plates 13 on the cup 11there are provided on opposite sides of the 'pan 5 similar supportingplates 15, also notched at their upper edges. Rods 16 of predeterminedweight restzin the notches in the aligned supports 13 and 15, these rodsbeing supported either by the cup or by the side walls of thepan' .5,according to the relative position of the cup in the pan.

As shown in the drawings, the lower edges of the sides of the invertedcup 11 are cut away at the sides, as at 17, and at the ends, U. S.Patent Nos. 1,553,844

v and 1,553,848. granted September 15, 1925.

In the operation of the device, the pan 5 is filled with a liquid to apoint below the as at 18, as more fully set forth in opening of theinner projecting wall sec tion 7, so that the lower edges of theinverted cup 11, when-the latter is in its closed.

horizontal position, are immersed. The center of pressure of the cup 11being offset from its support, on difference in pressure between thedevice with which the pipe section 7 communicates and the externalatmosphere, the inverted cup 11 is caused to" .the pan '5, the relativeheight of the plates 13 and '15 being so ad usted that the weight of therodis taken by the rising end of the cup substantially immediately uponthe beginning of its rise. The weights of the rods 16 therefore controlthe relative pressures required to tilt the seal and thereby open theinterior of the pipe section 7 to the atmosphere. The weights of therods 16 may be independently controlled, so that the same or differentpressures may be required .to open the seal when there is an excess ofpressure in the device with which the pipe section 7 communicates andwhen there is suction within the pipe section 7. The position of thepivots for the cup 11 are preferably so determined that the center ofgravity of the cup is slightly below the supporting point.

By the construction hereinbefore described, it has been found that theoperation of the seal is very greatly steadied, and bobbing or rocking,apart from its proper tilting movement, substantially prevented.Furthermore, its construction is materially simplified and inspectionfacilitated.

, The weights 16 which loosely rest in detachable edge relation to thepan and cup permit of the interchanging of weights of greater or lessweight with great ease and accuracy, as such changes may be desired withrelation to pressure conditions.

Although the present invention has been described inconneetion with thespecific details of apparatus for carryin it into etlect, itis notintended that these details shall be regarded as limitations upon thescope of the invention, except in so far as included in the accompanyingclaims.

I claim:

1. A seal comprising an open conduit member communicating with a vaporspace, a pan surrounding said conduit member and adapted to contain aliquid, an inverted cup over said conduit member and having its sidesimmersed in the liquid in the pan, said cup being pivotally supportedat. one side of its center of pressure, and Interchangeable members ofvarying predetermined Weights adapted to loosely rest in removablecontact with said pan and cup and supported by the Walls of the cup orthe pan according to the relative changes in position of the cup in thepan.

A seal comprising an open conduit member communicating with a vaporspace. a pan surrounding sa d conduit member and adapted to contain aliquid, an inverted cup over said conduit member and having its sidesimmersed in the liquid in the pan, said cup being pivotally supported atone side of its center of pressure, and interchangeable members ofvarying predetermined weights adapted to loosely rest in removablecontact with said pan and cup and supported by the walls of the cup orthe pan according to the relative changes in position of the cup in thepan, and seats carried by the pan and cup in which said Weight membersrest.

A seal comprising an open conduit member communicating with a vaporspace, a pan surrounding said conduit member and adapted to contain aliquid, an inverted cup over said conduit member and having its sidesimmersed in the liquid 1n the pan, said cup being pivotally supported atone side of its center of pressure, and inter changeable members ofvarying predetermined u'eights adapted to loosely rest in removablecontact with said pan and cup and supported by the walls of the cup orthe pan according to the relative changes in position of the cup in thepan,'and ali ned seats carried by the pan and cup in udiich said Weightmembers rest.

HAROLD V. ATWELL.

